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TIL that the hubble telescope required the most perfect mirror ever created. Work on it had to be done at night because the vibrations caused by cars driving 4 miles away were enough to cause damage.

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OlpX TIL that the brain detects if your diet misses some important nutrients, and then makes you eat food that contains them.
AD8B7 TIL Steven Spielberg, Robin Williams, and Dustin Hoffman did not take salaries for the movie 'Hook'. Instead, they split 40% of TriStar Pictures' gross revenues.
MZEb TIL the Elephant Man was unable to sleep lying down for his whole life and finally experimented, leading to his death. It was claimed that his death was due to the desire that had dominated his life—the pathetic but hopeless desire to be ‘like other people’
LQbWQ TIL: why Election Day in the US is on a Tuesday: so farmers could get to the polls and still have time to get their crops to market.
DYde TIL that a librarian found smallpox scabs stored inside a 19th century medical book. In the 1800s scabs from infected people would be inserted into healthy people as a means of vaccination. These scabs have the potential to shed light on The evolution of the small pox vaccine used in the Us today.